Amy Schumer may have spent the past week in a hospital, battling a kidney infection, but she joked that she's still, in fact, feeling pretty.

On Friday, the comedian and actress posted a series of hospital selfies on Instagram to explain why she wouldn't be in attendance at the upcoming London premiere of her film I Feel Pretty. The first two photos attached show Schumer lying in a hospital bed with two IVs in her arm, while the other two show her husband, Chris Fischer, and younger sister Kim Caramele staying close by in her hospital room.

"Here's what I've been up to this week. I was hospitalized for 5 days with a horrible kidney infection. I want to give a big thank you to the doctors, the bad ass nurses also my husband who's name is, i want to say, Chris? and my sisters Kimby and mol who have been by my side the whole time," Schumer captioned the photos.

"I wanted to share this with you because this is sexy as hell but mostly because I was meant to go to London for the opening of I Feel Pretty and my doctors have told me that's a no go. I'm really disappointed selfishly to miss this trip because I love London and Europe in general and all the great people (food) there. But I need to put my health first."

Kidney infections are no joke, by the way.

The condition is essentially a urinary tract infection (UTI) that traveled to one or both of your kidneys, according to Mayo Clinic. The symptoms are pretty similar to those of a UTI—but worse—and include: fever, chills, back or groin pain, abdominal pain, frequent urination, burning or pain when urinating, nausea and vomiting, pus or blood in your urine, and urine that smells strongly or is cloudy. Sexy as hell, indeed.

If you think you may have a UTI or kidney infection, get to a doctor, ASAP. These infections don't just go away on their own—they require antibiotics and sometimes, in severe cases, hospitalization. If left untreated, severe kidney infections can permanently damage your kidneys or the infection could travel to your bloodstream and be life threatening, according to Mayo Clinic.

Schumer went on to write that she's "so grateful" for the support I Feel Pretty has received since its release last week, and encouraged others to see the film, in which Schumer plays a woman who hits her head and wakes up with a newfound abundance of self-confidence.

"I hope people check it out in England and everywhere else in the world. It's sweet and fun and you will walk out feeling better. Which is something I hope to feel soon too," she wrote.